Harby e



'H. E,, CAMPBELL.

ELECTRFC SWITCH.

APPLICATIONEILED FEPLZ, 19:9.

Patented Apr. 6, 1920.

t ll hein;

proved switch.

HAnhY 1-1. CAMPBELL, or

MILWAUKEE. WISCONSIN, ASSIGNOR T0 UNION ELECTRIC MFG. CO., 0F MILWAUKEE, WISCONSIN, A CORPORATION OF WISCONSIN.

ELECTRIC SWITCH.

Specification of Letters Yatent.

Patented Apr. 6, 1920.

i Application filed September 2, 1919. Serial No. 321,181.

To all whom it may concern:

Be it known that l, HARRY l Canrnmln, a citizen of tho Unitod Status, and rcsidont of Milwaukee, in tho county of ltlilwaukco and State of \Vioconsin, have invented new and useful linpromlnonts in Electric Switches, of which tho following is a do- Scription, rc'fcrcncc living had to the. tll't'UlH-- panying drawings, which urra part of this specificat ion My invention rot-aim ii! imprmcmcnts in electric switchcu and morn particularly to stationary contact for swil'ohcnin which lhc movable wiipurutiug contacts arc arrangcd to make a sliding contiwt thcrowith.

One object of thc prchcnt invcntion is to provide a contact which may ho roadily rcmoved for rcpnirc, but which may ln'. as easily replaced.

Another object of tho invrntion is to provide covcred spring Int-ans for readily dotachably retainlng thc poutact finger in pivotal connection with its support and for yieldingly urging tho rontact linger to cngagelnont with tho sliding: contact. (I i A further ohjcct of tho invcntion' is to provide a simple but nuhstautial contact which will insurc a good clccl'ru-nl councction with its coiipcrating movahlc contact. and which will prone vi-ry durnhlc in scrvirc.

With tho above and othcr ohjccts in view which will appear as tho dcacription procoeds. my invcntion rcsidco in tho novcl constiul' thm, Nnnliiuatiou and nrrmngvmcut. of parts". substantially as hcroiual'tcr do scribed, and more 'particnlal'ly dclincd l) V tho nppondcd claims. it hciug Hnh'lislmnl that such changes in thc prcciuc cinhmlnncnt of tho llel'klllltlihtfl IHi'tl madc as (:olno within tlurscopo In tho acconunmying drawing. l have illustrated onc complctc cxmnplc oli tho physical cnibodimcnt. of my invcut-ion; run structml according to thc host modc l have. so far devised for the practical application of the principles ill(.ll't-()f,'ttll(l in which:

Figaro l. is a Sltltu vlcvation of my nnof tho olnnus.

Fig. 2 is-a broken away and ll] StNlilUllE-l to morn clearly illustrate th-tailcd construction.

inwution may ho top plan vicw thcrcol ,-purl:-:

taincd spring mrans for maintaining tho switch linger in pivotal connection with its support, said mcaus lining dctachcd from the switch.

My invention is particularly applh-nhlo to drum controllers, and thorct'orc I havc shown the invention uscd in such a connection in tho accompanying drawing. it should he undcrstood howcvor, that contacts cmhodyin my invention may hc used for various oticr typos ol' HWil 'lHl-i. it; hcing unnecessary to show a complctc controllrr in ordcr to discloso my iuvcntion, I hurt! mcrcly shown onc ol'- tho drum augments; and its voilpcrating contact ling'cr. I hav shown a shalt 1 having a contact sogmcnt and mountcd thou-on and nrrangcd to ongago a contact linger 3. Tho contact fingcr 3 compriscs an chnig'atcd lh'tl' of suitable conducting nmtcrial such an brass, and tho activc cod :1 of tho contact lingcr has sccur d to thc undcr sidc thcrool', or formed intcgrally thorcwith a suitnhlo contact portion ti prcl'oralily cul'vod to facilitate tho cngagcuncut thcrcol' with tho contact scgmcnt 2.

Noar its roar cud tho contact .liugcr has its sidc walls notchcd or rocosscd as at 7 to form at its roar cud a pair of lutorally projecting trunnions 8.

In drum controilcrs, it is customary to providc an insulating has-c t) For supporting tho cont-act lingcrh'. This bnsc may he t'orlncd ol wood or any othcr dcsirod nutterial. To this lnmc I sccurc by any suitmhle miaum such as sci-ow 10. a Support 11 f rthe contort linger. The support It as illustrutod is of right-angular shapo. and has in'ovidcd at tho lower end of its vcrtical portion a torlninnl portion 12 having hinding posts l3 and 14: thcreon for making the llosirml cloctric connection with the contact ling-ma 'lhc contact support or hearing block 11 may he formed ol' any suitable material, but in practice I prel'er lo I'ol'm the same ol' brass. and l'oruu-d on [he lop ol' the verlirally extending url'nrc ol' the sup port and near the outer end (hereof is a pair of spam-d upwardly cxl -ndiug cars l notched or l'(' 'l'-.-1(1l s a! ill to |ll'll\'llll' an open hearing l'or the lruuuiom a. This an rangement in cll'i-rt lorm a trunnion bcnl' ing for the conlact linger.

For maintaining the trunnions 8 ot' the contact linger in the recesses 16, and vet permitting the desired movement oi the contact linger. l have provided :1 llHHUll dcvu-e 17. This device comprises a cap nu-mher formed from a single sheet of material and provided with a lhimhlc or cup shaped cylindrical outer closed cud 18. having its iiiner ends direclcd outwardly and then downwardly t pr v id s mend arms In pro ided near their ends with slollcd recesse ill for detachable engagement \vilh the ridured or grooved ends 2] ol' :1 pin 22 lixed in support 11. The member 1T l\ ll'l:!llilll in position by means of an i-xlcnsilc spiral spring 23 confined in the; cap llltll llll'l' and having one end impinging agalnst the closed outer end 18' and its other end carrying a cup or nipple member 2i attached to engage in a. recess 25 in the support 11 and in the laminated lead connection 26 to' lH later described. This tension device provides means for yieldingly urging the rontact portion 6 to engagement with segment :3 and at the same time provides convenient means for readily permitting the disengagement of trunnions 8 from recesses In. To accomplish this. member 17 lfn'lilell to the position depicted by dotted lines in Fi 1 1o disengage slot 20 from the ends ll of pln an as will be obvious.

For limiting the movement of the contact finger under the influence of the spring 23, I have-provided the support 11 with an extension or projection 27 arranged to be engaged by an adjustable screw 28 carried by the contact finger and adjustably held in the desired position by means ,of a resilient locking member29; also secured to the contact linger. Witl'i this arrangement the retention of the contact finger in en agement with its sup )orting base is insure and the movement oii-said finger under the influence of spring 23 may be limited as desired, While the resiliency of the spring will allow said finger to yield to the movable contact and yet firmly hold the same in engagement therewith.

The laminated lead 26 insures a positive electrical connection between finger 3 and support 11 and has one end riveted or otherwise secured to finger 3,as at 30, and has its other end detachably secured to the sup port 11 by means of a bolt and nut member '%1. As best shown in Fig. 4, the lead 26 also serves to rolnin the linger 3 in raised position from [he movable contact 2 when lhc tension (ll'\'lLl ii; is removed.

li'on the l'oregoing description it will be readily seen that l pro\ idc a practical switch which will he ellicicid and durable for the purpose described.

What I claim as my invention is:

l. .\u electric svvilrh comprising a suport. a contact linger pivot-ally carried by 76 [he support. a housing conncctiblc with said support and having its major portion dis-- posed over said contact linger, and spring means ('onlnilu'd within the portion of said housing disposed over said contact finger 80 f r normally urging lhe same to engagement with a contact 5 in an electric switch, in combination, a support, :1 coulro-t linger having at one end an open pivolal bearing on said support and having at it; other end a contact. a cap member dclaclulhlv engaging said support. and means contained in said cap meniher for yieldinglv maintaining the contact linger in engagement u ith the support and permitting the movement ol' said contact.

3. In an electric switch. in combination, a support, a contact linger having at one end an open pivotal bearing on said support and having at its other end a contact, a cap 9') member detachably cngagcable with said support, and an extensile spring contained in said cap member for yieldingly maintaining the contact linger in. engagement with the support and permitting the movement of said contact.

4. In an electric switch. in combination, a support, a contact finger having at one end an open pivotal bearing on said support and having at its other end a contact, a cap member disposed over said contact member near said pivotal bearing, and means con tained in said cap member to hold the same in engagement with the support and permit movement of said contact.

.7. In an electric switch. in combination, asupport, a contact finger having at one and an open pivotal bearing on saidsupport and having at its other end a contact, a cap member disposed over said contact arm near said pivotal bearing and having a bifurcated portion forming arms, aid arms being engaged with the support, and means contained in said cap member and bearing. against the contact finger to hold the same in engagement with sup ort and permit movement of said contact nger.

6. In an electric switch, in combination, a support, a contact finger having at one end an open pivotal hearing on said support and having at its other end a contact, a cap member disposed over said contact arm near said pivotal bearing and having a bifurcated portion forming arms, means readily detachable securing the arms of said cap to the support, and means contained in said cap member and. bearing against the contact finger to hold the same in engagement with the support and permit movement of said contact finger.

'Z In an electric switch, in combination, a support, a contact finger having, at one end an open pivotal bearing on said support and having at its other end a contact, a cap member disposed over said contact finger, arms formed on said cap member and extending below the sides of said contact fin er and provided with recesses, proiections d mmed on said support and engageahle with the recesses of said arms, and means contained in said cap member for resiliently hearing against the contact finger to hold the same in engagement with the support and permit movement of said contact finger.

8. In an electric switch, in combination, a support, a contact finger having at one end :1 n open pivotal hearing on said support and luring: at its other end a contact, a cap memdisposed over said contact finger, arms willed on said cap member and extending liefliifi the sides of said contact finger and plW-Jldm'l with recesses, prqectmns formed on said sup port and engageable with the recesses of said arms, means contained in said cap member for yieldingly bearing against the contact finger to retain the same in an gegement with the support and to permit the movement of said contact finger, and means juxtaposed said cap member and engaging said support to limit the pivotal movement of said contact finger.

9. In an electric switch, in combination, a. support, a pair of notched upstanding ears on said support, a contact finger trunnions formed on said finger at one end thereof, a. contact portion at the other end of said finger, said trunnions engaging the notched ears of said support, resilient means for readily detachably retaining the trunnions in said notched ears to pivotally secure the contact finger to the support, means for detachably limiting the movement of the contact finger by said resilient means, and a laminated lead havin one end riveted to said contact finger an its other end detachably fixed to said support.

In testimony whereof, I affix my signature.

HARRY E: CAMPBELL. 

